Slip sprocket-wheel.



PATENTED DEC. 19, 1905. J. M. DODGE SLIP SPROGKET WHEEL.

N FILED JUNE UNITED STATES PATENT OFFICE.

JAMES M. DODGE, OF PHILADELPHIA, PENNSYLVANIA, ASSIGNOR TO THE LINK BELT ENGINEERING COMPANY, OF PHILADELPHIA, PENN SYLVA- NIA, A CORPORATION OF PENNSYLVANIA.

SLIP SPROCKET-WHEEL.

Specification of Letters Patent.

Patented Dec. 19, 1905.

Application filed June 28, 1905. Serial No. 267,425.

To all whom it may concern.-

Beit known that I, JAMES M. Donen, acitizen of the United States, residingin Philadelphia, Pennsylvania, have invented certain Improvements in Slip Sprocket-Wheels,of which the following is a specification.

The object of my invention is to construct a sprocket-wheel for drive-chains in such a manner as to allow the rim of the wheel to slip on the hub when unusual tension is applied to the chain or to the shaft. This object I attain in the following manner, reference being had to the accompanying drawings, in which Figure 1 is a side view of my improved sprocket-wheel, partly in section. Fig.2 is a sectional view on the line 2 2, Fig. 1; and Figs. 3 and 4: are views illustrating modifications of my invention.

A is the hub-section of the wheel, which can be keyed or otherwise secured to the shaft C.

B is the rim-section of the wheel, having sprocket-teeth b, shaped according to the type of drive-chain used.

Referring to Figs. 1 and 2, the hub-section A has a web a and flanges a a, forming afiat face. On this face is secured a ring of fric tional material D, in the present instance consisting of, one or more strips of leather secured to the flanges by two series of rivets (Z. The parts are so proportioned that the rimsection B will fit tightly upon the frictionsurface, so that under ordinary conditions the rim-section and hub-section will turn together. In order to prevent lateral movement of the rim-section on the hub-section, I permanently secure a ring 6 to one side of the rim and detachably secure a ring to the other side of the rim. Both rings extend over the ends of I also preferably provide flanges e e, which are made in the form of rings and secured to the rim-section on each side of the series of sprocket-teeth to keep the chain in line. These flanges, however, may

be dispensed with in some cases.

In Fig. 3 I have illustrated a modification in which the side rings are dispensed with.

In this instance the hub-section A is made in two parts a and a so, shaped as to form an annular V-shaped groove in which the leather or other friction material D is placed. The ring-section B is shaped to fit this groove.

In Fig. 4 I have illustrated another modification in which the friction material D is on a line with the teeth of the rim-section B the rim-section being shaped so as to fit between the flanges of the hub-section A thus increasing the frictional surface.

I claim as my invention 1. The combination in a sprocket-wheel, of an unyielding hub-section, a rim-section having teeth thereon, with a ring of friction material mounted between the hub-section and the rim-section and secured to one section and fitting snugly on the other section, substantially as described.

2. The combination of a hub-section, a rimsection having sprocket teeth thereon, a leather friction-ring secured to the hub-section and fitting snugly into the rim-section, and side plates on the rim-section acting to retain the rim in line with the hub-section, substantially as described.

3. The combination of a hub-section having central web and side flanges, a friction-ring secured to the periphery of the hub-section by two lines of rivets passing through the flanges of the hub-section, with a rim-section fitting over the friction-ring and having teeth on its periphery, substantially as described.

4. The combination of a hub-section, a ring of friction material secured to the hub-sec scribing witnesses.

JAMES M. DODGE. Witnesses:

WVALTER OHIsM, J os. H. KLEIN. 

